We just got PP for a 6m x 4m x 4m (high) single pitch outbuilding which will be used as a garage and a workshop. The building is not subject to building control. The plot is immediately adjacent to a very mature Ash tree that is probably 10 metres high, as well as a mature apple tree. The trunks are both within 1.5 metres of the corner of our structure, and I'm worried about the effect that this might have on our foundations. I think we're on London clay.

Builder has said that a raft will do it, but I'm leaning towards piling (in the hope that my precious workshop won't end up leaning into the neighbours garden)

Could anyone give me some indication of how much piles might set me back? I'm guessing that 12ft or so would be sufficient? Not sure how many I'd need for those dimensions. Access is very easy.

Could anyone give me some indication of how much piles might set me back? I'm guessing that 12ft or so would be sufficient? Not sure how many I'd need for those dimensions.

Would it not be better to ask for quotes from companies that will do the job? that way they can see the site / ask relevant questions and advise you accordingly. I understand you are only looking for a "ball park figure" but there are too many variables and what if you were told it was £2k and it turns out to be £4k.

_________________Fret not, a forum is a collection of opinions. Above, are mine.

I reckon you're far too wize to try to avoid any heave from tree roots by cutting lumps off them. This is what happened to a close neighbour of mine after he allowed a contractor to level an area of his garden for decorative flagstone laying by doing just that, as can be seen in this picIt was reportedly not a particularly windy day when this came about.

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